ATTO EPCI-ESTR-000 Technical Information download pdf (Page 5)

ATTO ExpressStripe Installation and Operation Manual

2 RAID Overview

Originally Redundant Array of Inexpensive Disks, now Redundant Array of Independent Drives, RAID is a storage

system using multiple disk drives. ATTO ExpressStripe creates virtual disk arrays on physical drives to increase

capacity and performance.

Large amounts of data can be supported over many

smaller drives when the drives are combined into one

large “virtual” drive. Management is easier than using

several drives in a JBOD (Just a Bunch of Disks)

configuration.

RAID overlaps disk seeks, minimizing aggregate seek

time delays for the storage group as a whole. Data is

written in equal, short operations to each member of

the RAID group in turn so that when the first member

of a group begins writing to disk, the second member

is available to take data. This continues until the last

member of a group is writing to disk, and the first

member of a group is ready for data.

RAID also takes advantage of the Macintosh OS

ability to create partitions and volumes.

RAID Level 0

RAID Level 0 is commonly used when performance is

more important than data-protection.

RAID Level 0, or striping, achieves higher I/O

performance by breaking data into smaller units, then

writing the data to separate physical drives. These

striped volumes can then be read from the separate,

physical drives, and re-assembled into the actual data

with minimal delay. You must have at least two

physical drives to create a striped volume

ATTO recommendations

• Although RAID 0 volumes can be created using

different types and models of drives, use similar

types/models to ensure the access time is equal

to the average access time of a single drive

rather than the access time for the slowest drive.

• For maximum performance, use a dual channel

host adapter with drives equally distributed

across busses.

• Use RAID 0 in environments that demand high

I/O rates such as video production and editing,

image editing and pre-press.

• Since RAID 0 does not provide fault tolerance,

establish a backup policy to protect data stored

on RAID 0 volumes.

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ATTO EPCI-ESTR-000 Technical Information Page 5

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